Chair frame



FIG. 1 is a left-side, front-perspective view of a chair frame of my new design;

FIG. 2 is a front view of my new design;

FIG. 3 is a rear view of my new design;

FIG. 4 is a left-side view of my new design, the right-side view being a mirror image thereof;

FIG. 5 is a top-plan view of my new design;

FIG. 6 is a bottom-plan view of my new design; and,

FIG. 7 a left-side, front-perspective view of my new design, with the configuration of components that would comprise a complete chair shown in dashed lines. The portion of FIG. 7 shown in dashed lines merely depicts environment, and forms no part of the claimed design. 

The ornamental design for the chair frame, as shown and described. 